Colorforms

Colorforms were playsets that featured third-party licensed characters and themes that may still be produced today. The sets featured a cardboard backdrop of a specific theme (for example: "The Smurfs") with a smooth surface. The set would also come with a load of thin plastic static-cling type "stickers" featuring your favorite characters and various other items (books, various theme-related knick knacks, et cetera). One would peel the "stickers" off the page and stick them anywhere on the cardboard backdrop. The "stickers" were designed so that they could easily be removed and reused.